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Annex 01 Influences

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     ©   K   A   P   P   A   2   0   0   4  -   0   4   1   0   1   5 Wellbore Storage Influence NoStorageC=0.0001C=0.001C=0.01(ref)C=0.1C=1 -30.010.11101010010000000 Log-Log plot: dp and dp' [psi] vs dt [hr] -Wellborestorageeffecthas a dramaticimpact on theearlytime response, but atlong termwillnot makedifferencein thepressure response. Itisonlya delayingphenomenon. NoStorageC=0.0001C=0.001C=0.01(ref)C=0.1C=1 -3-2-101233800400042004400460048005000 Semi-Log plot: p [psia] vs Superposition time     ©   K   A   P   P   A   2   0   0   4  -   0   4   1   0   1   5 Skin and Well Radius Influence Skin andWellboreradius have equivalentimpact.  A positive skin has thesameeffectas shrinkingthewellbore radius, anda negativeskin willincreasetheapparent wellbore radius. Skin=0Skin=1Skin=5Skin=20(ref) -30.010.111010100100010000 Log-Log plot: dp and dp' [psi] vs dt [hr]   rw=0.3ft(ref)rw=1ftrw=3ft -30.010.111010100100010000 Log-Log plot: dp and dp' [psi] vs dt [hr]     ©   K   A   P   P   A   2   0   0   4  -   0   4   1   0   1   5 Skin and Well Radius Influence r  weq = r  w .e -S Equivalent radius:Sensitivity: a largerradius or a smallerskin willreducethepressure drop of a fixedvalue Skin =0Skin =1Skin =5Skin =20 (ref) -2-101210002000300040005000 Semi-Log plot: p [psia] vs Superposition time r    w =0.3ft (ref)rw =1ftrw =3ft -2-10123800400042004400460048005000 Semi-Log plot: p [psia] vs Superposition time     ©   K   A   P   P   A   2   0   0   4  -   0   4   1   0   1   5 Permeability and Viscosity Influence k =10mdk =33.33md(ref)k =100md -30.010.111010100100010000 Log-Log plot: dp and dp' [psi] vs dt [hr] mu=0.3cpmu=1cp(ref)mu=3cp -30.010.   111010100100010000 Log-Log plot: dp and dp' [psi] vs dt [hr] Permeabilityandviscositydramaticallychange therate of thepressure decline, andhave an opposite impact.
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